<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">
    /* 
      组件实例有一个state属性,当state属性发生改变的时候,组件会重新执行render得到一个新的虚拟DOM,然后开始diffing算法,并重新渲染
    
    */
    /* class Content extends React.Component{
      //state:定义当前组件内部的状态,状态是当前组件私有的
      state = {
        content:"真NP",
        count:0,
        isHot:true
      }

      render(){
        console.log("我render了",this);
        const {content,isHot,count} = this.state;
        return (
          <div>
            <h1>title</h1>  
            <p>{content}</p>
            <p>{count}</p>
            <p>{isHot?"热啊":"冷啊"}</p>
          </div>
        )
      }
    }

    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<Content/>) */


    class App extends React.Component{
      state = {
        content : "react",
        count :  1,
        isHot: true
      }

      render(){
        const {content,count,isHot} = this.state
        return (
          <div>
            <h1>title</h1>  
            <p>{content}</p>
            <p>{count}</p>
            <p>{isHot?"热啊":"冷啊"}</p>
          </div>
        )
      }
    }

    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<App/>)



  


  </script>
</body>

</html>